Free Free catalog: tested by us, made by others

All add-ons

Add-ons give your assistant new abilities: skills teach it a job, agents are helpers it can hand work to, and connectors link it to other programs. Every add-on here was installed on a clean test system first.

The tabs filter the list below for that kind of work.

Skills, Agents and Connectors Explained

Start here: must-haves for security testing

Most useful first. Install the first one, try it, then add more.

Start with this one

01
RecommendedskillPartly tested (needs an account)
Block dangerous commands
cc-safety-net
Stops the assistant before it runs a command that could delete your files.
Test: installs cleanly; its main features need an account we did not use. Not yet used on real work.
EveryoneWatch outThe install command changes your agent's hook settings. It runs a program on every shell command, so a bug in the tool could block normal work.
For any assistant
Paste this in the terminal
```
$ npx -y cc-safety-net@latest install
```
Other ways to install, and how we tested it

02
Check add-ons before you trust them
Snyk Agent Scan
Checks the extras you installed before you trust them.
RecommendedskillPartly tested (needs an account)
Install line
Paste this in the terminal
uvx snyk-agent-scan@latest
For any assistant. All steps and how we tested it
03
Security review of your code
Trail of Bits Skills
Security experts’ checklists to review your own code.
RecommendedskillPartly tested (needs an account)
Install: step 1 of 2
Step 1 of 2 · Type this inside Claude Code
/plugin marketplace add trailofbits/skills
For Claude Code. All steps and how we tested it
04
Reviewers for code changes
PR Review Toolkit (Anthropic)
Six reviewers that check a change for missing tests, hidden errors and unclear code.
agentInstalls cleanly
Install line
Type this inside Claude Code
/plugin install pr-review-toolkit@claude-plugins-official
For Claude Code. All steps and how we tested it
05
Quality and security reviewers
VoltAgent quality and security subagents
Reviewers for quality and safety: a security auditor, a tester and an accessibility checker.
agentInstalls cleanly
Install: step 1 of 2
Step 1 of 2 · Paste this in the terminal
claude plugin marketplace add VoltAgent/awesome-claude-code-subagents
For Claude Code. All steps and how we tested it

6 add-ons match your filters

6 add-ons match your filters.

·
Block dangerous commands
cc-safety-net
Stops the assistant before it runs a command that could delete your files.
RecommendedskillPartly tested (needs an account)
Install line
Paste this in the terminal
npx -y cc-safety-net@latest install
For any assistant. All steps and how we tested it
·
Check add-ons before you trust them
Snyk Agent Scan
Checks the extras you installed before you trust them.
RecommendedskillPartly tested (needs an account)
Install line
Paste this in the terminal
uvx snyk-agent-scan@latest
For any assistant. All steps and how we tested it
·
Security review of your code
Trail of Bits Skills
Security experts’ checklists to review your own code.
RecommendedskillPartly tested (needs an account)
Install: step 1 of 2
Step 1 of 2 · Type this inside Claude Code
/plugin marketplace add trailofbits/skills
For Claude Code. All steps and how we tested it
·
Reviewers for code changes
PR Review Toolkit (Anthropic)
Six reviewers that check a change for missing tests, hidden errors and unclear code.
agentInstalls cleanly
Install line
Type this inside Claude Code
/plugin install pr-review-toolkit@claude-plugins-official
For Claude Code. All steps and how we tested it
·
Quality and security reviewers
VoltAgent quality and security subagents
Reviewers for quality and safety: a security auditor, a tester and an accessibility checker.
agentInstalls cleanly
Install: step 1 of 2
Step 1 of 2 · Paste this in the terminal
claude plugin marketplace add VoltAgent/awesome-claude-code-subagents
For Claude Code. All steps and how we tested it
·
Security check for Gemini
Gemini CLI Security extension
Lets Gemini check your own code for security problems.
skillPartly tested (needs an account)
Install line
Paste this in the terminal
gemini extensions install https://github.com/gemini-cli-extensions/security
For Gemini CLI. All steps and how we tested it

Every must-have for security testing: skills, agents and connectors